super-snuvi/src/me/hammerle/supersnuvi/entity/components/ai/PlatformController.java

package me.hammerle.supersnuvi.entity.components.ai;

import java.util.ArrayList;
import me.hammerle.snuviengine.api.Shader;
import me.hammerle.snuviengine.api.Texture;
import me.hammerle.supersnuvi.entity.Entity;
import me.hammerle.supersnuvi.gamelogic.Level;
import me.hammerle.supersnuvi.tiles.Tile;
import me.hammerle.supersnuvi.util.Face;
import me.hammerle.supersnuvi.util.Utils;

public class PlatformController extends Controller
{
    private final static Texture TEXTURE = new Texture("resources/platform.png");
    
    private static class MoveData
    {
        private final float x;
        private final float y;
        private final float speedX;
        private final float speedY;
        private final int waitTicks;
        
        public MoveData(float x, float y, float speedX, float speedY, int waitTicks)
        {
            this.x = x;
            this.y = y;
            this.speedX = Math.abs(speedX);
            this.speedY = Math.abs(speedY);
            this.waitTicks = waitTicks;
        }
    }
    
    private final ArrayList<MoveData> dataList = new ArrayList<>();
    private int moveIndex = 0;
    private int waitTicks = 0;
  
    @Override
    public boolean isAnimated()
    {
        return true;
    }
    
    public void addMoveData(float x, float y, float speedX, float speedY, int waitTicks)
    {
        dataList.add(new MoveData(x, y, speedX, speedY, waitTicks));
    }
    
    public void clearMoveData()
    {
        dataList.clear();
    }
    
    private float clamp(float f, float min, float max)
    {
        if(f < min)
        {
            return min;
        }
        else if(f > max)
        {
            return max;
        }
        return f;
    }
    
    @Override
    public void tick(Entity ent, Level level) 
    {
        if(dataList.isEmpty())
        {
            return;
        }
        
        MoveData data = dataList.get(moveIndex);
        if(ent.isAt(data.x, data.y))
        {
            waitTicks++;
            if(waitTicks >= data.waitTicks)
            {
                waitTicks = 0;
                moveIndex = (moveIndex + 1) % dataList.size();
            }
        }
        else
        {
            float motionX = clamp(data.x - ent.getX(), -data.speedX, data.speedX);
            float motionY = clamp(data.y - ent.getY(), -data.speedY, data.speedY);
            ent.applyOwnForce(motionX, motionY);
        }
    }

    @Override
    public void renderTick(Entity ent, float lag)
    {
        TEXTURE.bind();
        float x = Utils.interpolate(ent.getLastX(), ent.getX(), lag);
        float y = Utils.interpolate(ent.getLastY(), ent.getY(), lag);
        
        int mid = (int) Math.ceil((ent.getWidth() / Tile.SIZE) - 2);
        float endY = y + ent.getHeight();
        
        Shader.getTextureRenderer().drawRectangle(x, y, x + Tile.SIZE, endY, 0.0f, 0.25f, 0.25f, 0.4453125f);
        x += Tile.SIZE;
        for(int i = 0; i < mid; i++)
        {
            Shader.getTextureRenderer().drawRectangle(x, y, x + Tile.SIZE, endY, 0.25f, 0.25f, 0.5f, 0.4453125f);
            x += Tile.SIZE;
        }
        Shader.getTextureRenderer().drawRectangle(x, y, x + Tile.SIZE, endY, 0.5f, 0.25f, 0.75f, 0.4453125f);
    }

    @Override
    public void onCollideWithEntity(Entity ent, Entity other, Face face)
    {
        if(face == Face.UP)
        {
            other.applyForce(ent.getOwnForceX(), 0.0f);
        }
        else if(face == Face.LEFT || face == Face.RIGHT)
        {
            other.applyForce(ent.getOwnForceX() - other.getOwnForceX(), 0.0f);
        }
    }
}